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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '273b04c9dbb0d8c6da59531069de14f39d7ad0b9588279996f4c95d8ec2f3023' 
  AND token = 'f/cKAnLlNdu8dtWvybzmCKa3R+N3bojoAiVQSXxKg+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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