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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd82956f3846440af09f19b0179ffd87deb2857800b59b0276269b482ec80f0' 
  AND token = 'uGNs4sQXyvJmbGJd4jQvfKZ9TzNkD/ROkVi6r0Ii7iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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