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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb3ea4786cb4070246f3b05eaa3a84851543a54df59a7409bb906739dd146d0' 
  AND token = '26Zr7xQmV8vv0ceWX25FAyY52oCNe82KTtM2HU5TZNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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