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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1b5e4c6cfc674b0d7a7bc57d1d2e746e51abcbd7e5a7e0c9ad7ec2fe407603' 
  AND token = 'QNb9yJ/AWvsijQdqCnRD9yF1/Im//GxkSO+EeMjByGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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