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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70903306d1f5ceddca4382fdd01ea71fd57a2e8c2967bfbd74270c050285950b' 
  AND token = 'fABq+0H+Bo4kYtFkCMXOOm5kd4BkTpOhCZDZiU++JxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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