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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f37b32d58460064257ff69cc4292cf4920e1c4b32528c3d0a6dc0bb29aed74' 
  AND token = 'FRdLCK+ykKbySQEFzECOyItaCZJSkq/qiC5t9wZ+UMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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