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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e747f60ab8914cf00d9235062ad670e080db562836c6035f9198966537f844' 
  AND token = 'ZpI4dQXfhu4ThGfsW/TdAbEsrO7ca2jX6LEg1qWNcNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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