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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d93fa90afbfef2ea03936211fdc8b59a2ce2c3e16a4a287767c8529adb955b' 
  AND token = 'x4i/MuMA9p9xvx68Zyh4Umw0Dtwdtl8GkoLAPq8pIOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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