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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abaa87b4734d12330519374589979582384f886561ad2a568294b4e431fdd475' 
  AND token = 'vUH1J9Cu1+4b/Ab+0SeKv/h+HgN0OOnzsPUOb7A5ZLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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