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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d2dd50c9bdd5be0672580d53bf9b612b2a34c39a9b03658192854cb4472b6b' 
  AND token = 'E8ICSKQza5W/+IW5vqqS0THompkPuVtqBDgcD76ctnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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