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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198f73057a2c60d94fcf17ec5fec0dc9a2f4c64d1ffe3d71e358c55d49f0debb' 
  AND token = 'HCrfBSyl/CjbpcZi6L/XR7EcBq2fE26BTpdnl7bZns8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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