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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6e1af60467c235ca062ecfa092f72f329440d229f1026aabeeaccc6bd692c2' 
  AND token = 'W1gFANJvZzNOaulXbo7hAoK+Yw5dyH0zrsQkZc80K1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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