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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7731321ece3f68b2d66f768e1d0149e654c4c01e0ae3e08c1126cce7cf33708' 
  AND token = 'zJAewlPzEnTFkgJqNJ+BEsA4jgdoWmw3ZixYocZek74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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