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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6200fe4bce331801eee4c84a9ca63fc405eeeb3d1cf3cf40b29e55a38e28362' 
  AND token = '0PTlM6jIcdvwMNJ3GaO2n+I/ZrZ6ax9Mk15uWPM5Mwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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