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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7794e057c622618094fdbd3e1a0d3d16fc8d845d05961794857d678b13348403' 
  AND token = '9FdGxGKM+dkkxX7pe9BH2lJFFziOtCP2WhLUiei6k+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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