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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2389dc05f7766ed4f02ac7cc45d8598aa7baf196c3376eeb5978e303703a8767' 
  AND token = 'wEV6cteqimVbgpG99QEimZ/P0S5Zm36rIvF7fIEhwRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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