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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231878beb544c6ea36bbfb7a6266ed7e4e324b4daba19173f71795dbde2140e5' 
  AND token = 'HH+6+30Z5vETIcpbUzM44UdE+lanaYxb9yYUSF3oz2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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