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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060abbc0b80fe6a9f79784dadcad087576b3f4a1631eff720b1a50d68604e908' 
  AND token = 'dx1wM9g/6pABML0R0J672t+95shyX7f6Qq3Uzm/V0i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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