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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e171d2d4924c45cf837d92fd15bd7bc455c47d62b0e1cae5bd484d989b0a3abf' 
  AND token = 'lz8lDUBrNZgpGdyhA0s3Ws9jpkkU5XD41C9vOc9fOFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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