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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5e1745b7e37d4ae06fd1252b32aec1b94e4be6e2b8144bad7d24ac2443c0dc' 
  AND token = 'qmo0/YGZICoHE76UFvDcaj84kc2xa6dSOfkFl2nEyYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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