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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e42ecdfa67fbc5f8c8900d0f0374c14634dc91026d145bf76e01dd6a86fe1b8' 
  AND token = '9vOvAkPtbtgx9xCF/PMDd19CmwmNREiGZORmvCpYADo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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