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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60b5d2781f85a4e634a8fa493a134e7f69aeacdf33ba9a86435f8da64bfd545' 
  AND token = '/hhOH4NTtJu8sRpWUtE5n6XDf4/CZjJahRPJv5bI75c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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