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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6cf75794e1319410793d0b378b0be16412d605c25124d322cc26323feafe6a0' 
  AND token = 'bh+2Hr5oB+Gh9+lXO6XgkRWuzKML2kUstJ6AkeeDNzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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