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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3143d2062a7657a214ad297c96ab364f5ade07d9d437ee534064548e9c59fbbe' 
  AND token = '1BqLwPNoDeKZiziSISKJd86UnWYUDtMB2hUpa/EL2z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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