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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbaaf03e69cd96e3445a7cde50a795b36514cb537785cd3ed78a3cfe71763351' 
  AND token = 'R0IN2vNFCMu6p35rHNnwMYwBhuwk66cx1fLovufQhbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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