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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204deaa7f2d2e22691772a54d62c6309d2d8bf800c65c2213d3daecb5ce8df8c' 
  AND token = 'CVw5vNEsY+tC+cHHA2e0uX4OCk8cCfrJXD6egrKERKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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