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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1464a0fd0054f971da876aece955215e57609faebeb4e76dd75a6da0ad6704e' 
  AND token = '/yxS6N1IRgQel7he8NwVxcghtEo02JIfw+KFsoUXa1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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