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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1dad91049b74b2e69586df65522aa904723dad687deeed724752d26209c19bd' 
  AND token = 'zxJnYmNOI1OQSvUJqmXv8lKdMkPR6BPJ/tnwF5fmJSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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