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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1ca84f061a598751b7e6ed51e1fcf1098a2a9079d16bd6a0771c5e2072f011' 
  AND token = '3zs48Jj5R+XUrmfkdsvJcf6YnjhiyNAARKh+crw95V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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