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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10955a635ef26d0dc6c3cdd898acd7a9b940042f345c24989fcec7e1d7586051' 
  AND token = 'x7IiTM4ZpD7LjlcVc/nLrl/wObBsZiYewhABn4x/kkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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