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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab573797da87e42ede0feebb4d5ed741337990f7d10a3f52a9d287b08eea8c65' 
  AND token = 'iKtvWtZ3dvv2Fz7tHpqr/ppp9wJ85ESMIgZUGiWzwog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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