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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12aba7edf8ee05beaea488873f6d2bbd92a82ff1b4b3a83f440e7d6d47aa0256' 
  AND token = 'EPpPSVYSDFbpwhAv6NR7gUnJULsXUbZZC4qv8w5X/tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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