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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a547f5a51826a4192abb7d3e86022eff465ce4fdff9eae6ea0f527cd34a1f2' 
  AND token = 'hol4/qy0AoIV2oyZXN+A+sPGxuvSJqS6d+PxeFWV484=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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