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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd9bf77db62a086debcf4d0c387d778f97f3619f4a53362c97d258c6859cbdc' 
  AND token = 'SGASazem+notioaCHiYo47kTXZr6XblPz9hzCNe7P1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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