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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf1cb2a0feb92968c8339d5af401984e3a9dcc678a00886a85009147c0ad30e' 
  AND token = '03hDQzYLaKlTG4DtzOSMGr+2oRPSLkT6i0zMejEKG9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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