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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47d4a40b81fe726bad82d31186d824a0aea3ba1077fa89c3babfa15cc8c0fd1' 
  AND token = '1RjGkw+EAXKbklUp8NhBkCOYkX6yh0S2WTNGjRNK4cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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