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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdeaac4894e848ffee1088cd1af6299ffa5e19f6cc2c2a8c50db2657986f65fa' 
  AND token = 'QJ1Z66ZeyPZVNMxN0w2h2RnDTEb/nsP8aP6WKilXLjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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