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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b659c83160f1ee9edfe6873c2bff70b677bcf535c2ef4a0df7b3ba8d58aea532' 
  AND token = 'm4E7Th+gC75Yn9ifd+SOENjsQfaUakst+Am4DiivXYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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