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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf51a17d8c371137018c251d0138f80d37fa3e326e01bfbae3d228c97cb9558' 
  AND token = 'FNW4n/5j0BFZrqmmcSVMrkUrF6to5xMG+CI0kinv6+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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