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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8098983c4cc8f1dca8b58d6d390d5cf567277a546c1cbf667bb8554f531ce8' 
  AND token = 'UN6mso9JmedkXSb2R181K6EkjX/UzNU7q3+HghnBCTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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