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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4eab2892de895315b57102d8df8ab29f92e02fdee1acca7e58ed944775f6cae' 
  AND token = '+VQYIjL/Y+fKit5gaVrjgg3Qw1BmiaBWC0qXgVVk7tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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