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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9368d52b8b6b971e5340c7d266853dce84010a4fc2860359faa74030c4351dc2' 
  AND token = 'ldwHGgqnNRK+M5w29qQQok2e7E3LHx7St+TIHGeoNEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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