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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7bcf42da99569fbc4188898bb60e7364c49ea5b34b4cf6605b84de52be0f30' 
  AND token = 'UATgR1ZSVUlaVhqwH9vZyjcSUq57kSYjfVNGAlnbaJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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