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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9228276bed7abf10807dc3addf90b6e261b0c47fdc606e7f2909ab753567c3f' 
  AND token = 'hxL4fMXa9h7qPL3GV/kuTTedlsEiFesQZE7ge86d9i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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