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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40186bfab5c5df6becdaaab1812a59e4dcacb1267694d35eaa353350ad85cfe' 
  AND token = '4J2BKuNrPB4JwJ9qjTcvDzvIS7QAre0lD0jryZd6RCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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