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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01655ea60a513732dca8226dafa238c64ada2c091b63f27d96c62ece3a3e0d6' 
  AND token = 'biyDCGC6GyV+MZNFfnux6jv2SPGUhKKVeuXroGwv/Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}