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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6477288ee1ebdfb5e1292f51ebcba8bdfb366a89a5854c3bb1d13f2e1bb3dce4' 
  AND token = 'bPWKbozCTR1dm9miAEUC3EX6Cye+l4wlw7CQLWnQ7oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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