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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5992943874c6c375641ff6a0d5ecc7c1a739b03502328f5dd0b762c8924e7167' 
  AND token = '0AiBvStlj0CW2FylK9/S7FJ5d6XcqAEbcaPSI9H1OUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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